/*
 * @(#)DefaultModule.java   0.3-3 06/05/2001
 *
 *  This file is part of the HTTPClient package
 *  Copyright (C) 1996-2001 Ronald Tschal�r
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA 02111-1307, USA
 *
 *  For questions, suggestions, bug-reports, enhancement-requests etc.
 *  I may be contacted at:
 *
 *  ronald@innovation.ch
 *
 *  The HTTPClient's home page is located at:
 *
 *  http://www.innovation.ch/java/HTTPClient/
 *
 */

package org.everrest.http.client;

import org.everrest.core.util.Logger;

import java.io.IOException;
import java.net.ProtocolException;

/**
 * This is the default module which gets called after all other modules have
 * done their stuff.
 *
 * @version 0.3-3 06/05/2001
 * @author Ronald Tschal�r
 */
class DefaultModule implements HTTPClientModule
{
   /** number of times the request will be retried */
   private int req_timeout_retries;

   private static final Logger log = Logger.getLogger(DefaultModule.class);

   // Constructors

   /**
    * Three retries upon receipt of a 408.
    */
   DefaultModule()
   {
      req_timeout_retries = 3;
   }

   // Methods

   /**
    * Invoked by the HTTPClient.
    */
   public int requestHandler(Request req, Response[] resp)
   {
      return REQ_CONTINUE;
   }

   /**
    * Invoked by the HTTPClient.
    */
   public void responsePhase1Handler(Response resp, RoRequest req)
   {
   }

   /**
    * Invoked by the HTTPClient.
    */
   public int responsePhase2Handler(Response resp, Request req) throws IOException
   {
      /* handle various response status codes until satisfied */

      int sts = resp.getStatusCode();
      switch (sts)
      {
         case 408 : // Request Timeout

            if (req_timeout_retries-- == 0 || req.getStream() != null)
            {
               if (log.isDebugEnabled())
                  log.debug("Status " + sts + " " + resp.getReasonLine()
                     + " not handled - maximum number of retries exceeded");

               return RSP_CONTINUE;
            }
            else
            {
               if (log.isDebugEnabled())
                  log.debug("Handling " + sts + " " + resp.getReasonLine() + " - resending request");

               return RSP_REQUEST;
            }

         case 411 : // Length Required
            if (req.getStream() != null && req.getStream().getLength() == -1)
               return RSP_CONTINUE;

            try
            {
               resp.getInputStream().close();
            }
            catch (IOException ioe)
            {
            }
            if (req.getData() != null)
               throw new ProtocolException("Received status code 411 even" + " though Content-Length was sent");

            if (log.isDebugEnabled())
               log.debug("Handling " + sts + " " + resp.getReasonLine()
                  + " - resending request with 'Content-length: 0'");

            req.setData(new byte[0]); // will send Content-Length: 0
            return RSP_REQUEST;

         case 505 : // HTTP Version not supported
            return RSP_CONTINUE;

         default :
            return RSP_CONTINUE;
      }
   }

   /**
    * Invoked by the HTTPClient.
    */
   public void responsePhase3Handler(Response resp, RoRequest req)
   {
   }

   /**
    * Invoked by the HTTPClient.
    */
   public void trailerHandler(Response resp, RoRequest req)
   {
   }
}
